Socket for incandescent electric lamps



(No Model.)

0. G. PERKINS. SOGKET FOR INGANDESUENT ELEGTRIG LAMPS Patented Sept. 12,1893.

JNVENTOR BY lZar/w fl/Zlhg we if ATTOR Y I VITNESSES UNITED STATESPATENT OFFICE.

CHARLES G. PERKINS, OF HARTFORD, CONNECTICUT.

SOCKET FOR INCANDESCENT ELECTRIC LAMPS.

SPECIFICATION forming part of Letters Patent No. 504,743, datedSeptember 12, 1893.

Application filed July 10. 1891. Serial No. 399,097. (No model.)

To roZZ whom it may concern.-

Be it known that I, CHARLES G. PERKINS, a citizen of the United States,residing at Hartford, in the county of Hartford, State of Connecticut,have invented certain new and useful Improvements in Locks for HoldingElectrical Appliances in Position, of which the following is aspecification.

The object of the invention is to provide means for preventing thedetachment of the parts of couplings, by reason of the shocks to whichthey are liable to be subjected when in use. The invention, however, isespecially applicable to incandescent lamps, and for this reason will beillustrated and described in connection with such devices.

In the accompanying drawings, Figure 1, shows a perspective view of anincandescent lamp and the coupling parts thereof, and Figs. 2 and 3illustrate modifications of the same.

A is an incandescent lamp, and D, the socket thereof, which isinternally screwthreaded at its center for the reception of theexternally screw-threaded extension C of the coupling section B, whichcarries the key and devices for establishing and cutting ofi the circuitthrough the lamp. The socket and extension C form one terminal of thelamp or device,the other terminals being formed by a metallic ring orcollar E on the section B and a ring or collar F also of metalsurrounding the socketed portion of the lamp. The ring E is made ofspring metal and is bent up so as to form a rib 6, while the ring F isprovided with a series of corrugations, corresponding in shape to therib 6 so that the two willperform the double function of making a goodelectrical contact, and locking the parts of the coupling againstaccidental displacement. The number of ribs and corrugations isimmaterial. It is clear from the above that when the coupling parts arescrewed together, the two rings will slide over each other andsuccessive corrugations will engage with the rib, each further movementmaking a firmer connection between the parts. I prefer to make the ringE yielding, and to give it some play so as to allow several of the corrugations to pass successively over the rib. If desired, the play can begiven to the ring F instead of the ring E, and the socket may be made inthe coupling section B, and the screw extension formed at the center ofthe ring F without departing from my invention. When the parts are inplace, they are held firmly by the pressure of the rib into thecorrugation which last covers it and there is no danger of the lampworking loose; and at the same time the best electrical contact is made.The parts E and F need not, necessarily, be complete rings, but can beother shapes as well.

In Figs. 2 and 3, I show a construction in which separate devices areemployed for performing the electrical and mechanical func tions of myapparatus. G and II are contact rings,Iis the corrugated ring, and J isa short strip of spring metal bent to form a rib for entering thecorrugations on the ring I. The mode of operation is obvious.

I have shown the device in combination with an electric incandescentlamp, but I may use it with any other electrical appliance which issubjected to shocks that tend to loosen it from its support.

What I claim as my invention is 1. The combination, in an electriccoupling, of a coupling section having aprojecting screw-threadedextension and a ribbed wing with a corresponding coupling section havingan internally threaded socket, and. a radially corrugated contactsurface adapted to engage the rib to make close electrical contacttherewith and lock the parts, substantially as described.

2. The combination, in an electric incandescent lamp, of a lamp sectionhaving an internally threaded socketed ring at its top, provided withradial corrugations and a coupling section having an externallyscrewthreaded section, and an elastic ribbed ring adapted to engage theradial corrugations, the socket and screw extension forming one terminal of the circuit through the lamp, and the ribbed and corrugatedrings, the other terminal, substantially as described.

3. In an electric incandescent lamp having on its couplingend a radiallycorrugated conon the end of its neck, the ring terminal betact surface,of aco-operative device provided ing corrugated or roughened. IQ

with a rib adapted to engage the corrugated In testimony whereof I havehereunto set contact surface to make electrical connection my hand this1st day of July, A. D. 1891;

5 therewith and lock the parts of the coupling, CHARLES G. PERKINS.

substantially as described. Witnesses:

4. An incandescent electric lamp having a FREDERICK DAVIS, centralterminal and an outer ring terminal G. H. STOCKBRIDGE.

